#include <iostream>
#include <cstring>

using namespace std;

int main() {
	char s[2000];
    int k = -1, nr;
    cin.getline(s, 2000, 0);
    int lg = strlen(s);
    for (int a = 0; a < lg; ++a){
        if (isalpha(s[a])){
                nr = 1;
            while (s[a] == s[a + 1]){
                    ++nr;
                    ++a;
            }
                cout << nr;
        }
        cout << s[a];
    }
	return 0;
}